Fluidized bed dryer

ABSTRACT

IN A FLUIDIZED BED DRYER HOT AIR IS INTRODUCED INTO THE BOTTOM OF THE DRYER THROUGH NOZZLES FIXED IN A COOLED DISTRIBUTOR PLATE.

Sept. 20, 1971 J. 1'. ENDERS 3,605,276

FLUIDIZED BED DRYER Filed July 25, 1969 United States Patent "i 3,605,216

Patented Sept. 20, 1971 3,605,276 27 forces air or any other drying gas through heater 28 FLUIDIZED BED DRYER into compartment 29 below the distributor plate 21.

Joseph T. Erfilers, Belil-keley, Ill., ass1gl10r Nozzles 30 pass the hot gas from compartment 29 File 3:1; g $33 gg gg gfi 940 through distributor plate 21 to fluidize material to be 2 5 dried in chamber 14.

Chums Pnomy g'gggfl? Bmam July 1968 The water cooled nozzles 30 and the distributor plate Int, Cl, F26}; 17/10 21 cannot bake material thereon and so defluidize ma- U.S. Cl. 34-57A 2 Claims terial in chamber 14. In addition, cleaning and maintenance of the apparatus is greatly reduced. The residence time of hot gas in chamber 29 and its time in passage ABSTRACT OF THE DISCLOSURE through nozzles 30 is so short that the hot gas is not In a fluidized bed dryer hot air is introduced into the "{Ppreclably Q This result? i effiment opfira' bottom of the dryer through nozzles fixed in a cooled dis- 9 W bed dryer of this mvelttlon' tributor plate. ThlS invention allows the use of a higher temperature drying gas so that a smaller volume of gas may accomplish a given result. This allows the use of a smaller chamber BACKGROUND OF THE INVENTION 14 for a given dried chemical production.

When certain materials are being dried in a fluidized What is Claimed is: bed dryer, such as ammonium sulphate, other chemicals, 1. In a fluidized bed dryer having a drying chamber, and many polymers, some particles may contact the hot means introducing a hot fluidizing gas into the bottom of distributor plate and the nozzles fixed therein to bake, Said m r, m ans introdu i g int aid Chamber a stick thereon, and aggregate to defluidize the bed, material to be fluidized and dried, means conducting the I fiuidizing gas from the upper portion of said chamber, SUMMARY OF THE INVENTION and means separating dried material from said fluidizing A hollow distributor plate is Water cooled and has gas: the Improvement comprismg in combmatlon a nozzles transfixing it to pass a hot drying gas there tributor plate in the bottom of said chamber formed from through. The high heat conductivity of the metal nozzles two spaced apart pamtlon P p each whlch allows them to remain relatively cool while passing a hot extends through both of Sald pamtlon plates passing the drying gas through the cooled distributor Plate to Preh g g i thereflmzughtsaidgartition p p ati at ri l on the i mg a ui 1g compar men, sa1 means 1nro uc1ng zzl cicii y of t h e ci ryi g gffs th r oifgh th 11 1; g i 2 a flurdrzrng gasunto said chamber introducing said gas short residence time in them prevents any appreciable below S.ald dlsnllbutor plate to flow thrqugh nozzles C 001mg of the h Cate d drying gas means introduclng a coolant between said partltion plates cooling said partition plates and said nozzles, and means withdrawing said coolant from between said partition platesand from said fluidized bed dryer.

2. The combination according to claim '1 wherein said coolant is water.

BRIEF DESCRIPTION OF THE DRAWING 3 The figure is a vertical section through a fluidized bed dryer according to this invention.

DESCRIPTION OF THE PREFERRED References Cited EMBODIMENT UNITED STATES PATENTS A fluidized bed dryer has a hopper 10 which is charged Kosijahn etla] 23 284X with material 11 to be dried. Hopper 10 is loaded through 3O16624 U196; gr at a 34 57AUX an air tight lid 12. A chute 13 conducts material 11 to 304O439 6/1962 34 57A the chamber 14 of the fluidized bed dryer when the gate 3147084 9/1964 ig -ag 3 331; 14 is opened.

3,215,508 11/1965 -P1ester 34-57AX Chamber 14 has a conical top 16 from WhlCh a duct 17 leads to a conventional separator :18 from which dry 3277582 10/1966 Munro et a1 34 57A product falls downward in duct 19 and from which fluidizing gas with picked up moisture leaves through duct 20. FREDERICK MATTESON Pnmary Examiner The fluidized bed drier has a hollow distributor plate R, A DUA, Assistant E i 21 formed by the spaced apart partition plates 22 and 23. Cooling water 25 from pipe 24 flows between plates US. Cl. X.R.

22 and 23 and is withdrawn through pipe 26. A blower 2328-8.35 

